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valid, <strong>the</strong> supplicant (client device) is allowed to access resources located on <strong>the</strong><br />

protected side of <strong>the</strong> network.<br />

QUESTION NO: 2<br />

What is a difference between TACACS+ and RADIUS in AAA?<br />

A. Only TACACS+ allows for separate au<strong>the</strong>ntication.<br />

B. Only RADIUS encrypts <strong>the</strong> entire access-request packet.<br />

C. Only RADIUS uses TCP.<br />

D. Only TACACS+ couples au<strong>the</strong>ntication and authorization.<br />

Answer: A<br />

Au<strong>the</strong>ntication and Authorization<br />

RADIUS combines au<strong>the</strong>ntication and authorization. The access-accept packets<br />

sent by <strong>the</strong> RADIUS server to <strong>the</strong> client contain authorization information. This<br />

makes it difficult to decouple au<strong>the</strong>ntication and authorization.<br />

TACACS+ uses <strong>the</strong> AAA architecture, which separates AAA. This allows separate<br />

au<strong>the</strong>ntication solutions that can still use TACACS+ for authorization and<br />

accounting. For example, with TACACS+, it is possible to use Kerberos<br />

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